on the tree 或 in the tree.
下面例句，根据语境选择。
The bird is in the tree.
鸟在树上。
perch on the tree
在树上栖息
in the tree
Birds are singing in the trees. 鸟在树上唱歌。
如果是一只鸟 则用in the tree.
on the tree
有长在树上之意,如:Buds appear on the trees in spring.春天树木发芽了
也有在枝头之意,如:The raven cawed on the tree.乌鸦在树上呱呱叫着
on the tree
希望对你有帮助
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